stoeger m3500 shells and choke tubes

im looking at getting an extended choke for my stoeger but since i cant test them before i buy it anyone have any info to narrow my search and possibly what shells i will patern it just dont want to buy a million different things thanks

I used the Kicks (before they sponsored Duck Commander) High Flyer with great success. I have been using Kent Fasteel for years, and have had fantastic results with it. It's clean, low recoil and my gun has cycled every single round I put through it.